A Comprehensive Study of the Environmental Deterioration Process of High-Strength Bridge Wires

本研究的根本目的是系统、全面地调查高强桥梁线材在实际使用条件下的环境恶化情况。这项研究将集中在四个不同的任务上。在任务1，一个适当的确定应力强度和分布在高强度电线将被调查。将考虑由于线材制造过程产生的残余应力的重要性，由于线圈拉直产生的初始应力以及由于施加外部负载产生的应用应力。任务2将调查在正常和加速环境/线材反应条件下线材劣化率的确定，而氢脆和腐蚀辅助开裂的影响将是任务3的重点。变质的镀锌和未镀锌的桥线以及新的桥线将进行模拟腐蚀性环境的实验测试。将进行理论分析来解释实验结果。任务4将集中于评价线材冶金对腐蚀环境中线材劣化率的影响。根据前几项任务的结论，将对线材制造和新材料的最新发展进行研究

*** 9532082 Betti The fundamental objective of the research is a systematic and comprehensive investigation of the environmental deterioration of the high-strength bridge wires under the actual service conditions. The research will focus on four different tasks. In task 1, a proper determination of the stress intensity and distribution in high-strength wires will be investigated. The importance of residual stresses due to wire manufacturing processes, initial stresses due to straightening of coiled wires and applied stresses due to imposed external loads will be considered. Task 2 will investigate the determination of the rate of wire deterioration under normal and accelerated conditions of environment/wire reactions while the effects of hydrogen embrittlement and corrosion assisted cracking will be the focus of task 3. Deteriorated galvanized and ungalvanized bridge wires as well as new wires will be subjected to experimental testing simulating aggressive corrosive environment. Theoretical analyses will be performed to interpret the experimental results. Task 4 will concentrate on the evaluation of the effects of wire metallurgy on the rate of wire deterioration in a corrosive environment. Studies on recent developments in wire manufacturing and on new materials will be conducted in view of the conclusions from the previous tasks.***